Hmmm well lets see. What kind of lighting do you need? Do you need something bright enoegh to locate grey hairs on your head in the mirror or something bright enoegh to use the jon at night?
I have an Arc LSH-P and i find it MORE than enoegh light for my bathroom which is roughly the same size as yours (~80 square feet). I can easily read fine print, especially with the light pointed directly to the ceiling and/or reflecting off the mirror. A flashlight of similar output is bright enoegh to find your way around a master bedroom, living room, and even a patio if you could reflect the light just right. It may not be enoegh light to read by if you aren't close to the source, but it sure is enoegh output to be used as an emergency light or a (LATE)night light.
You don't have to spend THAT much money for that much light though. Just find a 1Watt Luxeon based flashlight drawing at least 400mah - that should be enoegh light for a bathroom that size....heck...even the Arc AAA is enoegh light when u have to use the crapper late at night. I once showered with only my Arc AAA once....but that's a different story.